This color represents the millennium because of the calming zen state of mind it induces. Blue is known to be a calming color.
Leatrice Eiseman, executive director of the Pantone Color Institute®, said that looking at a blue sky brings a sense of peace and tranquility. “Surrounding yourself with Cerulean blue could bring on a certain peace because it reminds you of time spent outdoors, on a beach, near the water—associations with restful, peaceful, relaxing times. In addition, it makes the unknown a little less frightening because the sky, which is a presence in our lives every day, is a constant and is always there,” Eiseman said."

Cerulean Blue - Pantone Wiki: "Pantone's Cerulean Blue 15-4020 was the 2000 Color of the Year.
This color represents the millennium because of the calming zen state of mind it induces. Blue is known to be a calming color.

The openness of the web, the opportunity to publish on it and additionally in closed environments with an HTML5 app, the future friendliness of web technologies to the markets and environments of tomorrow is what we should be thinking about. A lot of the demands for “protected code” reminds me of a band trying to write a song that nobody else could play. "

Why skies are blue instead of purple - Technology & science - Science - LiveScience | NBC News: ""Your eye can't tell the difference between that complex spectrum and one that is a mixture of pure blue and white," Smith said.
In other animals, the sky color is undoubtedly different. Outside of humans and some other primates, most animals have only two types of cones instead of three (dichromatic vs. trichromatic).
Honeybees and some birds see at ultraviolet wavelengths that are invisible to humans."

Logistic Regression: "To avoid the pesky need to configure learning rates, regularization parameters and annealing schedules, you can use the AdaptiveLogisticRegression. This class maintains a pool of CrossFoldLearners and adapts learning rates and regularization on the fly so that you don't have to."